Boiler



Sept. 11, 1928. 1,683,837 A. M. MERTZA-NOFF BOILER Filed Oct. 5, 1925 :5 sheets-sheet 1.

7Q 1 Lil 4 ATTORNEY Sept 11, 1928. 1,683,837

A. M. MERTZANOFF BOILER Oct. 5, 1925 3 Sheets-Sheet 3 N INVEN TOR.

BY i 71.

%.,; ATTORNEY.

Patented Sept. 11, 1928.

UNITEDSTATES PATENT, OFFICE.

DRE M. *MERTZAiT OFF, OFNEW YORK, N. Y,, ASSIGNOB TO AMERICAN RADIATOR GOHPANY, OF'NEW YORK,'1\T. Y., GORPORATIOH-OF NEWJERSEY.

H BOILER. 7

Application filed October 5, 1925. Serial No. 60,693.

Further, said invention has for its object to provide a boiler in which the secondary air required to effect the complete combustionofthefuel is introduced into the boiler .atthe lowestpractical temperature.

Further said inventionhas'for its object to i provide a boiler in which the secondary air necessary to effect the completev combustion will, due to its introduction at such relatively low temperature into the combustion chamber containing therelatively lighter hot combustible gases, be caused to attain a high velocity or rate of flow,and be brought more or less forcibly into contact with the bed of incandescentfuel and the hot gases and products of combustion emanating therefromr i v Furtheusaid invention has for its object to provide. a boiler in which the secondary air is introduced into the boiler through a transverse duct having a long, relatively narrow outlet, and utilizing the temperature differential betweenthe air in said duct and the gases within the combustion chamber to convert the pressure head of said air into velocity or rate of flow in order to effect the due mixture of said air with the combustible gases to effect complete combustion.

Further, said invention has for its object to 7 provide a boiler 1n whlch the secondaryair required to effect the complete consumption of the fuel is caused tobe discharged into the combustion chamber in the form of a broad band extending transversely entirely across the fuel receptacle adjacentyto the rear end of the grate, and brought forcibly into intimate mixture with the products ofcombus' otion. a a Further, said invention has for its object 3 to'provide a boiler in which the secondary air isconducted to acentral point within the boiler and then uniformly. discharged transversely across thefuel bed and mixed with:

as the same pass from thecoinbustion wall port-ions oppositely curved to: form a constricted outletproducing a Venturi tube action or effect. Y l

FUItl161,-S2Lltl invention has for its object to provide a boilerin which the secondary air. is conducted into the boiler and to the cen tral part of a transverse duct having a rela tively narrow longitudinal discharge opening therein in order that the voliune of air-entering said duct may b'e'caused to issue from said discharge opening at high velocity and be projected forcibly, in the form of a downwardly flaring band, against the bed of incandescent fueland into intimate contact with the combustible gases and products of combustion passing between said duct and the bed of fuel.

Further, said inventionhas for its object 'to provide a boiler in which the secondary air, is-i ntroduced into the-boiler from the opposite sides thereof and conducted to a central point within the boiler, and then uniformly discharged transversely across the fuelbed 1 and mixed with the products of combustion cham' ber to the fines. i

c Other objects will in part be obvious and .in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends my invention consists in the novel details of construction, and 111 the combina' .tion, connection and arrangement of parts view showing the form of'the secondary air duct; and Fig. 6, is a rear end elevationof the boiler. In said drawings 10 designates a boiler of the sectional typecomprising-a hollow from;

section 11, a hollow'back'section 12, and a plurality of hollow intermediate sections 13. a

The saidfront, back .and intermediate sections are cominunicatively. connected 'at their grate.

upper and lowerportions by nipples 1 1, in 1 the usual manner.

The front section is provided with the usual flue openings 15, fuel openinglG, slic-v ing opening 17, and ash pit opening 18 which 7 are respectively provided with doors 15 16 11"18. The back section is provided with a smoke outlet 19 over which is secured a flanged smokehood 19.

ljlach intermediate section 13 is here shown in the form of an endless loop having hollow vertical portions 20, forming the side walls of the boiler, and hollow horizontal top and bottom portions 21, 22, respectively. The intermediate sections 13' are further cacli provided with registering hollow transverse members 23 which jointly form the crown sheet or topofthe combustion chamber. Intermediate said transverse members 23 and the top transverse members 21 are the longitudinally extending outer andintermediate lines 24, 24 and 243. The hot gases and products of "combustion are caused to pass upwardly at the rear of the combustion chamber into the fines 24c and 24", and forwardly therein from the rear of the boiler, and thence rearwardly through the center flue24." to the smoke outlet 19.

Adjacent to the rear end of the boiler two adjoining intermediate sections 13 are pro- "vided with integrally formed depending hol- 10w: members 26, which are arranged in spaced relation parallel to each other, and extending entirely across the interior space or combustion chamber at the rear of the The said depending members 26 have their opposin wall portions 27 adjacent to their lower edges curved inwardly towards each other to form a constricted outlet terminating in t gradually flaring mouth which communicates with the secondary air space or line 28 formed between said depending members 26.

.T'l'he secondary air is admitted through openings29 at the opposite sides ofthe boiler and is conducted through the passages 28 formed in the u )per portions of the second- "ary air space 28 y the horizontal hollow water-backed partitions 26 integral with and extending from the opposing wallsj26; The inner ends of said partitions 26 are spaced from each other to provide an intermediate opening 30 through which the air is discharged from said passages 28 into the lower portion '28" of'saidalr space 28.

Asthe secondary air is admitted into the lurnace at a comparatively low temperature,

; and as the heatedgas and products of comliustion w thin the'con'ibustlon chamber possess' a relatively high temperature the secondary air, partly due to said dilfcrential in ten'ipeij'ature andpartly due to the tension of the draft, willjbecaused to issue under pressure or suction with great veloclty and 1mthe transverse air duct 28" at a point midway of: its ends, and caused completely to fill said duct, as a result of which the air will be discharged ev'enly and uniformly through the entire length of the constricted outlet,- in the form of a continuous sheet through which and with whichthe hot gases and products of combustion must pass after leaving the combustion chamber, and thus insure the complete combustion of the fuel.

The admission of secondary air to the passages 28 and duct 28 is controlled by means of the closures 31 hinged at 32 over the openings 29. A sector 33 secured to each closure 31 is engageable with the edge of the opening to permit or" the closure being held to dillerent positions of adjustment whereby to control the amount of air admitted through said openings.

Having thus described my invention, what i claim and desire to secure by Letters Patent is:

1. A boiler of the character described comprising front, back, and. intermediate sccill) tions communicatively connected, certain of i said intermediate sections each having a depending water containing member communicating with the waterspaces of the boiler and arranged parallel in spaced relation to form therehetween a transverse duct having a constricted discharge opening atits base, and horizontal partitions dividing the end portions of said duct to form upper passages open at theouter ends thereof for conducting air to a point intermediate the cnds'of said duct and discharging the same into the lower portions thereof, substantially as specified. 1 1

2. In the heating apparatus of the cha 'acter described, means for supplying secondary air thereto from without comprising a duct having all of its wall portions watenbacked and extending transversely across the apparatus above and adjacent to the rear of the fuel bed, and having a longitudinal opening in its under side for directing said secondary air downwardly upon the bed of incandescent fuel and'to mingle with the gases and prodnets of combustion as the same are about to pass between said duct and the fuel bed, and horizontal partitions dividing the-outer portions of said duetto-form upper passages open at the outer ends thereof for conducting the secondary air to a pointintermediate the ends of said duct and discharging the same into the lower portions thereof, substantially as specified.

In a heating apparatus of the character described, means for supplying secondary air thereto compr sing a duct arranged transversely of the apparatus above and ad acent to the rear of the fuel bed and composed of till depending waterbacked members communi eating severally with the water spaces of the apparatus and arranged in spaced relation to one another with their lower edgesseparated to form a longitudinal discharge opening, and horizontal partitions dividing the outer portions of said duct to form upper passages open at the outer ends thereof for conducting the secondary air from Without to a point intermediate the ends of said duct and discharging the same into the lower portions thereof, substantially as specified.

a. In a heating apparatus of the character described, means for supplying secondaryair thereto from without comprising a plurality of transverse depending water-containing members substantially coextensive in length with the width of the apparatus communieating at their ends and upper intermediate portions with the water-spaces of the apparatus; said members forming therebetween a duct extending across the combustion chamber above and adjacent to the rear of the fuel bed and having a longitudinal discharge opening at its base, and hollow, water-backed iiartitions integral with and extending from i the opposing walls of said members and dividing the outer portions of said duct to form upper passages open at the outer ends thereof for conducting secondary air to a point inter-- mediate the ends of said duct and discharging the same into the lower portions thereof, substantially specified.

5. A boiler ofthe character described comprising a plurality of transverse sections comniunicatively connected; certain of said sections above and adjacent to the rear of the bed, of fuel each'having 21 depending watercontaining member communicating with the water spaces of its respective boiler section; said members being arranged in spaced relation to form therebet-Ween a transverse duct having a discharge opening at its base, and

horizontal portions extending from the op-' posing walls of said members and registerin at theirinner edges wlth each other to provide partitions dividing the outer portions of 6. A boiler of the character described i comprising a plurality of transverse sections communicatively connected; certain of said sections each having a depending water containing members communicating at its ends and upper intermediate portions with the water spaces of its respective boiler section; said members being arranged in spaced relation to form therebetween a transverse duct having a longitudinal discharge opening at its base,and horizontal, hollow, water-backed portions extending laterally from the opposing walls of said members and registering at their inner edges with each other to provide partitions dividing the out-er portions of said duct into upper and lower passages; said upper passages being open at the outer ends thereof. for conducting secondary air from without "the boiler to a point intermediate the ends of said duct and discharging the same centrally into the lower of said passages, substantially as specified.

7. In a heating apparatus of the character described, means for supplying secondary air thereto comprising a duct arranged trans versely of the apparatus above and adjacent to the rear of the fuel bed and composed of depending waterba cked members communicating severally with the water spaces of the apparatus and arranged in spaced relation to one another with their lower edges separated to form a longitudinal discharge opening; said duct having superposed parallel passages therein between said depending members; the upper of said passages having air inlet openings at its outer ends, and an outlet opening intermediate of its ends communicating with the'lower of said passages for conducting air centrallythereto, substantially as specified.

Signed at the city of New York, in the county and State of New York, this3d day of July, 1925. f

ANDRE M. MERTZANOFF. 

